META-INF.dirigible.dev-tools.ui.ThrottledWidget.js Maven / Gradle / Ivy
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import * as Common from '../common/common.js';
import {VBox} from './Widget.js';
/**
* @unrestricted
*/
export class ThrottledWidget extends VBox {
/**
* @param {boolean=} isWebComponent
* @param {number=} timeout
*/
constructor(isWebComponent, timeout) {
super(isWebComponent);
this._updateThrottler = new Common.Throttler.Throttler(timeout === undefined ? 100 : timeout);
this._updateWhenVisible = false;
}
/**
* @protected
* @return {!Promise}
*/
doUpdate() {
return Promise.resolve();
}
update() {
this._updateWhenVisible = !this.isShowing();
if (this._updateWhenVisible) {
return;
}
this._updateThrottler.schedule(innerUpdate.bind(this));
/**
* @this {ThrottledWidget}
* @return {!Promise}
*/
function innerUpdate() {
if (this.isShowing()) {
return this.doUpdate();
}
this._updateWhenVisible = true;
return Promise.resolve();
}
}
/**
* @override
*/
wasShown() {
super.wasShown();
if (this._updateWhenVisible) {
this.update();
}
}
}